Silver sulfide charge on silver ion8/11/2023 ![]() If a galena concentrate containing excessive amounts of iron, copper, and silver is treated the iron, copper, and silver are coextracted and must be separated. The system successfully treats classical concentrates such as chalcopyrite and galenas but as the concentrates become more complex in mineral composition, the ferric chloride system has several disadvantages. In this system the metal sulfide is oxidized by ferric chloride to produce metal chloride and elemental sulfur:ĬuFeS2 + 4FeCl3 → CuCl3 + 5FeCl2 + 2S………………………………………………………(1) More recently, Haver and Wong developed a ferric chloride leaching technique for treating chalcopyrite and galena concentrates. Also, some of the iron is extracted into solution and additional processing steps are required to remove it. The acid-oxygen leaching technique is more selective, but metal extraction is generally less than that obtained by chlorination. ![]() However, the system results in the dissolution of metals such as iron and arsenic and additional separation schemes are required to separate and remove these metals. Favorable metal recovery values are obtained with the chlorination technique. These factors have stimulated considerable interest in the development of hydrometallurgical procedures for recovery of metal values from sulfide concentrates.Ĭhlorination and acid-oxygen leaching procedures have been investigated for the recovery of metal values from sulfide concentrates. This situation has been compounded recently by increasing smelter costs. Marketing complex sulfide concentrates that contain a variety of metals along with arsenic and antimony has always presented a problem. To help reach this goal, the Bureau is conducting research to advance minerals processing technology, which includes investigations for recovering metals from complex sulfide ores and concentrates. One of the goals of the Bureau of Mines is to insure that an adequate supply of minerals is available to meet national, economic, and strategic needs.
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